The family members and friends of Bali bombing victims have come face-to-face with one of the terrorists responsible for the attacks for the first time ever.

Balinese locals Nyoman Rencini and Ni Luh Erniati lost their husbands and Melbourne man Jan Laczynski lost five friends in the 2002 bombing of the Sari Club in the tourist district of Kuta.

In a two-part special on SBS's Dateline they meet one of the terrorists who carried out the attacks, Ali Imron, and the man who gave him weapons training, Nasir Abbas, to confront them over the devastating effect the attack has had on their lives.

For the first time ever, Ali Imron has come face-to-face with family and friends of victims of the 2002 attack

Buildings and cars are on fire after the blasts at the Sari Club in Kuta in 2002, which killed 202 people

For years Australian man Mr Laczynski made Bali his 'home away from home'.

He worked for an airline and took advantage of discount airfares, spending most weekends on the Indonesian holiday island and most nights at the Sari Club where he had made friends with many staff members.

'You don't want to do it, but at the same time, you want to know why... why, why?'

Abbas gave weapons and explosives training to the terrorists who carried out the bombings including Ali Imron, his brothers Mukhlas and Amrozi, and their accomplice Imam Samudra.

Ni Luh Erniati's husband was working at the Sari Club when he was killed in the terrorist attack

Nyoman Rencini was left to bring up her three children alone when her taxi driver husband was killed in the terror attack

He said his brother-in-law Mukhlas – who has since been executed along with Amrozi and Samudra – started sympathising with the terrorist organisation after 'agreeing with the appeals made by Osama bin Laden' in 1999.

'Which is why he led the people who carried out the Bali bombing, in the effort to establish an Islamic state,' Abbas said.

Abbas has now left Jemaah Islamiyah and has been working with Indonesian authorities on deradicalisation programs since 2003, speaking to 300 people charged with terror offences.

'Please tell to others in Australia that I feel sorry,' Abbas told Mr Laczynski during their emotional meeting.

'I'm not asking for them to forgive me, but let them know what I'm doing now is against the terrorism.'

Mr Laczynski said he hoped Abbas was telling the truth.

'You're milling in your mind all this stuff, whether he's genuinely part of the solution or is he still part of the problem?' he said.

Ms Ni Luh said she hoped his work made a difference, but Ms Rencini – who was left to bring up her three children alone when her taxi driver husband was killed in the terror attack - said his words just brought up her sadness.

'No matter how well he explained it, I couldn't accept it,' she said.

Meet The Terrorists, a Dateline two-part special, airs Tuesday July 28 at 9.30pm and Tuesday August 4 at 9.30pm on SBS

Abbas tells the Bali bombing widows he has been working with authorities on deradicalisation programs